The new slides show more details of NSA's possible "direct access" into private companies servers — appearing to show surveillance gear installed on-site by the FBI.

The first slide shows the targeting process of an NSA analyst, with supervisor and FBI oversight to ensure that American citizens are not being targeted. On the second slide, a flow chart is shown, with private companies — such as Yahoo or Google — first providing data to the FBI, then on to the NSA or other agencies for processing upon request.

The data is intercepted by the FBI's "Data Intercept Technology Unit", the new slides suggest. From there it can be analysed by the FBI itself, or can be passed to the CIA "upon request".

It also automatically passes to various monitoring sections within the NSA. These include, the annotated slides suggest, databases where intercepted content and data is stored: Nucleon for voice, Pinwale for video, Mainway for call records and Marina for internet records.

Perhaps the most interesting slide is the fourth, which says there were 117,675 active surveillance targets in the Prism database, as of April 5.